All camelids spit - llamas, alpacas, vicuñas, guanacos, dromedary camels, and bactrian camels. Spitty, the lot of them.
Also, alpacas' and llamas' mating lasts for anything up to an hour.
Makes for interesting visits to farm parks. "Mam, what are they doing?", age-appropriate explanation, "Let's go and see the lambs being fed", 35 minutes later back at the alpaca enclosure "Look, Mam, they're still doing it!", "So they are. Shall we get an ice cream?"